单项选择题

A. data linkB. networkC. transportD. presentationE. phy……

Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?（）

A. data link
B. network
C. transport
D. presentation
E. physical

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热门试题

单项选择题Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）

A. physical
B. data link
C. network
D. transport

单项选择题Which option is a valid IPv6 address?（）

A. 2001:0000:130F::099a::12a
B. 2002:7654:A1AD:61:81AF:CCC1
C. FEC0:ABCD:WXYZ:0067::2A4
D. 2004:1:25A4:886F::1

单项选择题What is known as one-to-nearest addressing in IPv6?（）

A. global unicast
B. anycast
C. multicast
D. unspecified address

单项选择题Which type of cable is used to connect the COM port of a host to the COM port of a router or switch?（）

A. crossover
B. straight-through
C. rolled
D. shielded twisted-pair

单项选择题Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）

A. BackboneFast
B. UplinkFast
C. Root Guard
D. BPDU Guard
E. BPDU Filter